"we were all" or "we all were"

  1. Marisa was over the moon/ecstatic about becoming a mother; in fact we were all delighted.
  2. Marisa was over the moon/ecstatic about becoming a mother; in fact we all were delighted.
  3. Marisa was over the moon/ecstatic about becoming a mother.
  4. Marisa was over the moon/ecstatic about becoming mother.

Please let me know which of these four sentences are correct.

In addition,

does “all delighted” mean extremely delighted?
Does “we all were” mean “all of us”?
Do we really need the indefinite article after “becoming”?

Thanks

#1 and #2 are both possible but #1 is the more usual word order.

#3 is correct. #4 is normally incorrect (it may be just about possible in a certain special sense of “mother”, such as a “pretend” sense, but that is obviously not intended here).

“we all were” and “we were all” both mean “all of us were”. In “we were all delighted”, “all” is understood to modify “we” not “delighted”. In informal language it is possible for “all” to modify a following adjective, as in “I came over all funny”, but that is not how it would be read here.

Dozy,

  1. We all crammed into one car.
  2. We crammed all into one car.
    Which is the right one?

The first one is more natural.